html,
body {
    height: 100%;
    margin: 0;
}

.mainPage {
    display: grid;
    grid-template-columns: 200px auto;
    grid-template-rows: 40px auto;
    grid-template-areas: "header header" "left main";
    height: 100%;
}

.top {
    grid-area: header;
    background-color: #5ba4fb;
    box-shadow: #5ba4fb 0px 2px 2px;
}

.menu {
    grid-area: left;
    background-color: #eef5ff;
    box-shadow: #eef5ff 2px -3px 2px;
}

.menu ol {
    padding-left: 0px;
}

ol>li {
    list-style: none;
}

li>a {
    text-decoration: none;
    color: black;
}

.level1Ol {
    text-align: center;
}

.level1Li {
    height: 35px;
    margin: 1px 5px;
    line-height: 35px;
    background-color: #5ba4fb;
    color: white;
    cursor: pointer;
}

.level2Li {
    margin: 1px 5px 0px 5px;
    background-color: #8ecaea;
}

.main {
    grid-area: main;
}

iframe {
    margin: 0;
    width: 100%;
    height: 99%;
    border: 0;
}
